(a) The operation of a system that meets the requirements specified in § 307.10, or § 307.11 if the conditions for APD approval in §§ 307.5 and 307.15 are met; or

(b) Systems approved in accordance with part 95, subpart F of this title. This may include expenditures for a system which were disallowed by the Office because the system failed to comply substantially with an APD approved under § 307.15.